<!DOCTYPE html>
<meta charset="utf-8">
<link rel=author title="Mason Freed" href="mailto:masonfreed@chromium.org">

<div>This is a popup</div>

<style>
  div {
    /* Per spec: */
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    /* Per settings in test file: */
    width: fit-content;
    height: fit-content;
    border: 1px solid;
    padding: 1em;
    background: -internal-light-dark(white, black);
    color: -internal-light-dark(black, white);
  }
</style>
